Engagement delay for a push button controlled voltage generator for a dual band electronically tuned receiver

ABSTRACT

A ratchet engagement delay for a tuning voltage generator having a first turret for supplying a voltage for tuning a radio receiver in the AM frequency band and a second turret for supplying a voltage for tuning the radio receiver in the FM frequency band. A first ratchet mechanism has a driven member secured to the first turret for rotation therewith and a drive member which is rotated by a first push button actuator. A second ratchet mechanism has a driven member secured to the second turret for rotation therewith and a drive member which is rotated by a second push button actuator. A ratchet engagement mechanism is responsive to the actuation of the first push button actuator to engage the drive and driven members of the first ratchet mechanism after initial rotation of the driven member and responsive to the actuation of the second push button actuator to engage the drive and driven members of the second ratchet mechanism after initial rotation of the drive member to provide a ratchet engagement delay upon the first actuation of the first or second push button actuator after the other of said actuators has been actuated.

United States Patent 1 Maugans Aug. 28, 1973 ENGAGEMENT DELAY FOR A PUSHBUTTON CONTROLLED VOLTAGE GENERATOR FOR A DUAL BAND ELECTRONICALLY TUNEDRECEIVER [75] Inventor: Terrance W. Maugans, Kokomo,

Ind.

[73] Assignee: General Motors Corporation,

Detroit, Mich.

[22] Filed: May 5, 1972 21 Appl. No.: 250,561

Primary ExaminerBenedict V. Safourek Attorney-C. R. Meland, Howard N.Conkey et a].

[5 7 ABSTRACT A ratchet engagement delay for a tuning voltage generatorhaving a first turret for supplying a voltage for tuning a radioreceiver in the AM frequency band and a second turret for supplying avoltage for tuning the radio receiver in the FM frequency band. A firstratchet mechanism has a driven member secured to the first turret forrotation therewith and a drive member which is rotated by a first pushbutton actuator. A second ratchet mechanism has a driven member securedto the second turret for rotation therewith and a drive member which isrotated by a second push button actuator. A ratchet engagement mechanismis responsive to the actuation of the first push button actuator toengage the drive and driven members of the first ratchet mechanism afterinitial rotation of the driven member and responsive to the actuation ofthe second push button actuator to engage the drive and driven membersof the second ratchet mechanism after initial rotation of the drivemember to provide a ratchet engagement delay upon the first actuation ofthe first or second push button actuator after the other of saidactuators 3 Claims, 8 Drawing Figures [52] US. Cl. 325/315, 74/10 R,325/459, 325/468 [51] Int. Cl. 1104b 1/08 [58] Field of Search 74/10 R;325/315, 325/452, 458, 459, 464, 468; 334/11, 20, 17, 47

[56] References Cited UNITED STATES PATENTS 3,327,221 6/1967 Rieth325/391 3,432,760 3/1969 Andzer 325/452 3,596,216 7/1971 Walsh 334/20 Xhas been actuated.

J j E; E 0

L) O z z Z Z '3 I) 1- 2 2 LL ENGAGEMENT DELAY FOR A PUSH BUTTONCONTROLLED VOLTAGE GENERATOR FOR A DUAL BAND ELECTRONICALLY TUNEDRECEIVER This invention relates to an apparatus for switching a voltagetuned radio receiver between first and second frequency bands and forselecting among memorized voltages corresponding to desired frequenciesin either the AM or FM frequency bands and, more specifically, thisinvention relates to such an apparatus for switching between the AM andFM frequency bands without changing the previously selected frequency oneach respective band and for selecting among a plurality of voltagesrepresenting memorized frequencies in the respective frequency bands bythe use of two push button actuators.

An apparatus for generating tuning voltages for a dual band radioreceiver by the use of a pair of turrets containing potentiometersassociated with the respective bands is generally described inApplicants copending application Al4,680 which is assigned to theassignee of this invention. This invention is directed toward amechanism for switching a radio receiver between first and secondfrequency bands and for rotating a pair of turrets such as described inthe above identified copending application.

The principal feature of this invention is an apparatus for switchingfrom one frequency band to another frequency band by the actuation of apush button Without varying the previous frequency to which thatrespective band was tuned, with subsequent actuations of the push buttonbeing effective to rotate a turret to vary the tuned frequency of theradio receiver.

The invention may be best understood by reference to the followingdescription of the preferred embodiment of this invention and thedrawings in which:

FIG. 1 is a front elevation of the tuning voltage generator for anelectronically tuned radio receiver illustrating the various controlelements;

FIG. 2 is a front elevation of the tuning voltage generator as viewedfrom directly behind the face plate of FIG. 1;

FIG. 3 is a schematic drawing of the turrets for memorizing a pluralityof tuning voltages and the power input terminals and signal pickoffsthereof as viewed along lines 33 of FIG. 1;

FIG. 4 is a rear elevation of the tuning voltage generator as viewedalong lines 4-4 of FIG. 6 illustrating the contact board effective forswitching the receiver between first and second frequency bands;

FIG. 5 is a schematic drawing of the ratcheting mechanisms as viewedalong lines 5-5 of FIG. 2;

FIG. 6 is a schematic drawing of the ratcheting mechanism as viewedalong lines 6-6 of FIG. 2;

FIG. 7 is a schematic drawing of the tuning apparatus for positioningthe wiper arms of the potentiometers in the turrets as viewed alonglines 7-7 of FIG. 6; and

FIG. 8 is a schematic drawing of the ratcheting mechanisms as viewedalong lines 8-8 of FIG. 5.

Referring to FIG. 1, a face plate 10 includes a meter 12 having an AMscale 14 and an FM scale 16 which cooperate with an indicator needle 18to provide an indication of the tuned frequency of an electronicallytuned radio receiver in either the AM or FM frequency bands. An on-offvolume control knob 20 and a tone control knob 22 are provided toperform the conventional functions represented thereby. An AM pushbutton 24 is provided for switching the radio receiver for operation inthe AM frequency band and for selecting one of a plurality of memorizedAM tuning voltages representing desired frequencies in the AM band andan FM push button 26 is provided for switching the radio receiver foroperation in the FM frequency band and for sequentially selecting anumber of memorized FM tuning voltages representing desired frequenciesin the FM frequency band. A tuning knob 28 is provided to effect thegeneration of the desired tuning voltages for tuning the radio receiver.

Referring to FIG. 3, there is shown an AM turret 30 and an FM turret 32mounted for rotation as will be hereinafter described with reference toFIGS. 5 and 6. Each of the turrets 30 and 32 contain a plurality ofpotentiometer assemblies each of which has an output terminal 34 uponwhich a gear 36 is secured. Rotation of the gear is effective forpositioning the wiper arm of the potentiometer assembly associatedtherewith. The structure of the turrets 30 and 32 and the potentiometerassemblies carried thereby are described in Applicants copendingapplication Al4,680, which is assigned to the assignee of the presentinvention, to which reference may be made for specific details.Consequently, those details will not be described in this application.

Power is applied to the potentiometer assemblies in the AM turret 30 andthe FM turret 32 by brushes 38, 40, 42 and 44 which engage respectivelyslip rings 46, 48, 50 and 52. The brushes 38 and 40 are connected to thepositive terminal of an external voltage supply and the brushes 42 and44 are connected to an external ground.

As the AM turret 30 is rotated, the output terminals 34 of thepotentiometer assemblies carried thereby sequentially engage a signalpick-off wire 54. The output voltage of the potentiometer assemblyassociated with the output terminal 34 engaged by the signal pick-offwire 54 is supplied to the radio receiver to effect tuning thereof inthe AM frequency band and is supplied to the meter 12 of FIG. 1 toposition the indicator needle 18 so as to indicate the AM frequency towhich the receiver is tuned. When the FM turret 32 is rotated, theoutput terminals 34 of the potentiometer assemblies carried therebysequentially engage a signal pick-off wire 56. The output voltage of thepotentiometer assembly associated with the output terminal 34 engaged bythe signal pick-ofi wire 56 is supplied to the radio receiver to effecttuning thereof in the FM frequency band and is supplied to the meter 12of FIG. 1 to position the indicator needle 18 so as to indicate the FMfrequency to which the receiver is tuned.

As described in Applicants aforementioned copending application, theoutput voltage of each of the potentiometer assemblies carried by the AMturret 30 and the FM turret 32 can be varied by rotating the gears 36associated therewith until the output voltage at the correspondingoutput terminal 34 is of the desired magnitude. In this manner, each ofthe potentiometer assemblies can be adjusted so as to memorize a voltagerepre senting a desired frequency in either the AM or FM frequency band.Thereafter, any one of those frequencies may be selected merely byrotation of the AM turret 30 or the FM turret 32 until the signalpick-off wire 54 or 56, respectively, engages the output terminal 34 ofthe potentiometer assembly which supplies the voltage corresponding tothe selected frequency and by switching the receiver for AM or FMreception.

Referring to FIGS. 5 and 6, the AM turret 30 is mounted by a shaft 57 inthe back wall of a support structure 58 for rotational movementsrelative thereto. Although not shown in FIG. 6, the FM turret 32similarly is mounted in the same horizontal plane in the back wall ofthe support structure 58 for rotational movements relative thereto. TheAM turret 30 has secured thereto an insulating cylinder 60 which ismounted in a bracket 62 for rotational movements relative thereto, thebracket 62 being attached to the support structure 58 by means of screws64. The cylinder 60 and the AM turret 30 have a common axis of rotation. Similarly, the FM turret 32 has secured thereto an insulatingcylinder 66 which is mounted in the bracket 62 for rotational movementsrelative thereto, the cylin der 66 and the FM turret having a commonaxis of rotation. Insulating rings 69 and 70 are carried by theinsulating cylinders 60 and 66, respectively, to isolate the slip rings46 and 48 from the bracket 62.

The AM turret 30 has associated therewith a one-way drive mechanism 68which, in the preferred embodiment, is a ratcheting mechanism having atoothed driven member 70 positioned within the insulating cylinder 60and secured to the AM turret 30 for rotation therewith and a tootheddrive member 72, the teeth on the driven member 70 definingcircumferentially spaced indexing portions. The drive member 72 issupported by an actuator 74 which extends through a slot 78 in the drivemember 72 and terminates in a piston 80 which is housed within acylindrical opening 82 around the rotational axis of the AM turret 30. Acompression spring 84 engages the piston 80 and the back portion of theAM turret 30 and biases the actuator 74 in an extended or outwardposition.

The FM turret 32 has associated therewith a one-way drive mechanism 86,shown in the preferred embodiment to be a ratcheting mechanism, having atoothed driven member 88 positioned within the insulating cylinder 66and secured to the FM turret 32 for rotation therewith and a tootheddrive member 90, the teeth on the driven member 88 definingcircumferentially spaced indexing portions. The drive member 90 issupported by an actuator 92 which extends through a slot 94 (FIG. 8) andterminates in the FM turret 32 in the same manner as the actuator 74terminates within the AM turret 30. The actuator 92 is also biasedtoward its extended position by a compression spring identical to thespring 84.

A compression spring 96 engages a front wall of the support structure 58and one shoulder of an annular flange 98 on the drive member 72. Theopposite shoulder of the annular flange 98 is engaged by one arm of g aratchet engagement control lever 100. A compression spring 102 engagesthe front portion of the support structure 58 and one shoulder of anannular flange 104 on the drive member 90. The opposite shoulder of theannular flange 104 is engaged by a second arm of the ratchet engagementcontrol lever 100. The compression springs 96 and 102 tend to bias therespective drive members 72 and 90 into engagement with the drivenmembers 70 and 88, respectively. The ratchet engagement control lever isvertically supported by tabs 106 which project through respective slotsin the bracket 62 which permit a rocking motion of the lever 100. Thetabs 106 are maintained within the slots in the bracket 62 by the forceexerted on the arms of the ratchet engagement control lever 100 by theshoulders of the annular flanges 98 and 104 due to the force of thecompression springs 96 and 192.

The actuators '74 and 92 are each twisted so as to form a helix andproject through respective slots 108 and 110 in the front portion of thesupport structure 58. When the actuators 74 and 92 are fully extended,the surfaces of the helix do not project through the respective slots108 and 110 which serve to support the actuators 74 and 92 and preventthem from rotating. The AM push button 24 of FIG. 1 is mounted on theend of the actuator 74 and the FM push button 26 of FIG. 1 is mounted onthe end of the actuator 92.

When either the AM or FM push button is pushed to move the respectiveactuator 74 or 92 inward, the slots 78 and 94 in the drive members 72and 90 function as cam followers and the helix portions of the actuator74 and 90 serve as cams which engage the slots 78 and 94 of the drivemembers 72 and 90 which are rotated thereby in a clockwise direction. Ascan be seen, if the teeth of the drive member 72 and the teeth of thedriven member are meshed when the push button 24 is actuated, the drivemember 72 is rotated from a fixed position to a second position whichdefines a predetermined angle of rotation which in turn rotates thedriven member 70 and, consequently, the AM turret 30 through the sameangle. The degree of twist in the actuator 74 is such as to make theangular movement of the AM turret 30 of such a magnitude so as to rotateone of the output terminals 34 of the potentiometer assemblies withinthe AM turret 30 out of engagement with the signal pick-off wire 54 androtate the output terminal 34 of the following potentiometer assembly inthe AM turret 30 into engagement with the signal pick-off wire 54. Inlike manner, if the teeth of the drive member and the teeth of thedriven member 88 are meshed when the push button 26 is actuated, thedrive member 90 is rotated from a first position to a second positionwhich define a predetermined angle of rotation which in turn rotates thedriven member 88 and, consequently, the FM turret 32 through the sameangle. The degree of twist in the actuator 92 is such as to make theangular movement of the FM turret 32 of such a magnitude so as to rotatethe output terminal 34 of one of the potentiometer assemblies carried bythe FM turret 32 out of engagement with the signal pick-off wire 56 andto rotate the output terminal 34 of the following potentiometer assemblyin the FM turret 32 into engagement with the signal pick-off wire 56.When the actuated push button 24 or 26 is released the respectiveactuating member 743 or 92 is moved to its extended position aspreviously described to rotate the drive member 72 or 90 in the reversedirection to its original position where its teeth again mesh with theteeth of the driven member 70 or 88. Due to the nature of the onewaydrive means, the AM turret 30 or the FM turret 32 is not rotated in thereverse direction.

Referring to FIGS. 2,5, 6 and 8, an actuator plate 112 is mounted on thefront portion ofv the support structure 58 by screws lldwhich projectthrough slots in the actuator plate 112 into the front wall of thesupport structure 58. The slots in the actuator plate 112 permit lateralmovement of the actuator plate 1 l2 relative to the front wall of thesupport structure 58. The actuator 74 has a wedge 116 secured theretoand the actuator 92 has a wedge 1 18 secured thereto. The actuator 74and the wedge 116 form a cam having a lost motion portion 120 and aworking portion formed by the surface of the wedge 116 which engages acam follower 122 on the actuator plate 112 which is shifted laterally bythe wedge 116 when the push button 24 is actuated as shown in the brokenline position in FIG. 5. Similarly, the actuator 92 and the wedge 118form a cam having a lost motion surface 124 and a working surface formedby the wedge 118. When the push button 26 is actuated, the wedge 118engages a cam follower 126 on the actuator plate 112 which is shiftedlaterally thereby relative to the support structure 58.

The actuator plate 112 includes a tab 128 which engages the arms of theratchet engagement control lever 100 such that when the AM push button24 is actuated and the actuator plate 112 is shifted laterally thereby,the ratchet engagement control lever is rocked by the tab 128 to permitthe compression spring 96 to move the drive member 72 into engagementwith the driven member 70 and to move the drive member 90 against theforce of the compression spring 102 out of engagement with the drivenmember 88 as shown in FIG. 5. In similar manner, when the FM push button26 is actuated, the actuator plate 112 is shifted by the wedge 118 tomove the tab 128 so as to rock the ratchet engagement control lever 100to permit the compression spring 102 to engage the drive member 90 andthe driven member 88 and to move the drive member 72 against the forceof the compression spring 96 out of engagement with the driven member70. Due to the lost motion surfaces 120 and 124 of the actuators 74 and92 respectively, the drive members 72 and 90 are rotated by therespective actuators 74 and 92 from their first positions toward theirsecond positions prior to the engagement of the wedges 116 and 118 withthe cam followers 122 and 126. Consequently, if the push button 24 orthe push button 26 associated with the oneway drive mechanism 68 or 86which is disengaged is actuated, the drive member 72 or 90 associatedtherewith is rotated prior to the engagement with the driven member 70or 88 and the meshing of the teeth thereon with the teeth on therespective driven member 70 or 88. Therefore, the rotation of the drivemembers 72 or 90 is ineffective for rotating the AM turret 30 or the FMturret 32 until returned to the first position where the teeth mesh in adriving relationship with the teeth on the driven members 70 or 88.Consequently, the first actuation of the actuator 74 or 92 after theremaining actuator 74 or 92 has been actuated serves to move theactuator plate 1 12 to permit the engagement of the respective one-waydrive means 68 or 86 without rotation of the AM turret 30 or the FMturret 32. Subsequent actuations of that actuator 74 or 92 are theneffective for rotating the respective turret 30 or 32.

Referring to FIGS. 2, 4, 6 and 7, the tuning knob 28 is mounted on atuning shaft 130 which passes through slots in the face plate and thefront and back walls of the support structure 58 so as to have lateralfreedom of movement relative thereto. The shaft 130 is supported by theactuator plate 112 as shown in FIG. 6 so as to have rotational movementrelative thereto. The shaft 130 is also shiftable longitudinally of itsaxis relative to the actuator plate 112. A compression spring 132engages a disk 134 which is secured to the end of the shaft 130 oppositethe tuning knob 28 and the back portion of the actuating member 112 soas to bias the shaft 130 and the tuning knob 28 to an inward position asshown in FIG. 6.

A tuning gear 136 is carried by the shaft 130 for rotation therewith andis shifted by movement of the actuator plate 112 so as to be engageablewith the gears 36 on the AM turret 30 when the AM push button 24 isactuated and to be engageable with the gears 36 on the FM turret 32 whenthe FM push button 26 is actuated. The tuning gear 136 engages the gear36 on either the AM turret 30 or the FM turret 32 when the tuning knob28 is pulled to shift the gear 136 against the return force of thecompression spring 132. Thereafter, rotation of the tuning knob 28 iseffective for positioning the wiper arm of the potentiometer assemblyassociated with the gear 36 engaged by the tuning gear 136 to generatethe desired tuning voltage representing a desired frequency. As can beseen, repeated actuations of the AM push button 24 and the FM pushbutton 26 sequentially position all of the gears 36 into position sothat they may be engaged by the gear 136 so as to obtain the desiredmemorized tuning voltages.

To effect electrical switching between the AM and FM portions of theradio receiver, a contact board 138 has a movable portion 140 joined tothe back portion of the actuating member 112 by a coupler 142. Themovable portion 140 includes contacts 144 which are moved relative tostationary contacts 146 to effect the electrical switching between theAM and FM frequency bands of the radio receiver as the actuating member112 is shifted by actuations of the AM push button 24 and the FM pushbutton 26.

In operation of the apparatus described, the first actuation of the AMpush button 24 after the actuation of the FM push button 26 is effectivefor electrically switching the radio receiver for operation in the AMfrequency band and is effective for engaging the drive member 72 and thedriven member of the one-way drive mechanism 68 but is ineffective forrotating the AM turret 30. Thereafter, subsequent actuations of the AMpush button 24 are effective for rotating the AM turret 30 to vary thetuned frequency of the radio receiver in accordance with the memorizedvoltages represented by the potentiometer assemblies in the AM turret 30and, conversely, the first actuation of the FM push button 26 after theactuation of the AM push button 24 is effective for electricallyswitching the receiver for FM reception and for engaging the drivemember and the driven member 88 of the one-way drive mechanism 86 but isineffective for rotating the FM turret 32. Subsequent actuations of theFM push button 26 are effective for rotating the FM turret 32 to varythe tuned frequency of the receiver in accordance with the memorizedvoltages represented by the potentiometer assemblies in the FM turret32. As can be seen, if the AM push button 24 and the FM push button 26are alternately actuated, the receiver is effectively switched betweenAM and FM reception without varying the previously selected tunedfrequencies in the respective frequency bands, as the AM turret 30 andthe FM turret 32 remain stationary. To vary the frequencies in the AM orFM frequency band, it is required that the AM push button 24 or the FMpush button 26 be actuated twice in succession or to manually pull androtate the tuning knob 28 so as to rotate the gear 36 to vary thevoltage picked off by the signal pick-ofi' wires 54 or 56.

The detailed description of the preferred embodiment of the inventionfor the purpose of explaining the principles thereof is not to beconsidered as limiting or restricting the invention, since manymodifications may be made by the exercise of skill in the art withoutdeparting from the scope of the invention.

I claim:

1. An apparatus for switching a voltage tuned radio receiver betweenfirst and second frequency bands and for rotating a turret comprisingdrive means; driven means coupled to the turret for rotation therewith;first selectively operable means for imparting a drive motion to thedrive means when said first selectively operable means is operated;second selectively operable means; first actuating means operablyassociated with the first selectively operable means for engaging thedrive and driven means when said first selectively operable means isoperated, the first actuating means including lost motion means forpermitting the first selectively operable means to impart a drive motionto the drive means relative to the driven means prior to the engagementof the drive and driven means; second actuating means operablyassociated with the second selectively operable means for disengagingthe drive and driven means when said second selectively operable meansis operated; biasing means for maintaining the drive and driven meansengaged after initial engage ment by the first actuating means untilsaid drive and driven means are disengaged by the operation of thesecond selectively operable means; and switching means responsive to thefirst and second selectively operable means for switching the radioreceiver for operation in the first frequency band when the firstselectively operable means is operated and for switching the radioreceiver for operation in the second frequency band when the secondselectively operable means is operated.

2. An apparatus for rotating first and second turrets of a voltage tunedradio receiver comprising first drive means; second drive means; firstdriven means coupled to the first turret for rotation therewith; seconddriven means coupled to the second turret for rotation therewith; firstselectively operable means for imparting a drive motion to the firstdrive means when said first selectively operable means is operated;second selectively operable means for imparting a drive motion to thesecond drive means when said second selectively operable means isoperated; first actuating means operably associated with the firstselectively operable means for engaging the first drive and driven meansand disengaging the second drive and driven means when said firstselectively operable means is operated, the first actuating meansincluding first lost motion means for permitting the first selectivelyoperable means to impart a drive motion to the first drive meansrelative to the driven means prior to the engagement of the first driveand driven means; second actuating means operably associated with thesecond selectively operable means for engaging the second drive anddriven means and disengaging the first drive and driven means when saidsecond selectively operable means is operated, the second actuatingmeans including second lost motion means for permitting the secondselectively operable means to impart a drive motion to the second drivemeans relative to the second driven means prior to the engagement of thesecond drive and driven means; first biasing means for maintaining thefirst drive and driven means engaged after initial engagement by thefirst actuating means until said drive and driven means are disengagedby the operation of the second selectively operable means; and secondbiasing means for maintaining the second drive and driven means engagedafter initial engagement by the second actuating means until said driveand driven means are disengaged by the operation of the firstselectively operable means.

3. An apparatus for rotating first and second turrets of a voltage tunedradio receiver and for switching said receiver between first and secondfrequency bands comprising first one-way drive means including firstdriven means coupled to the first turret for rotation therewith, saidfirst driven means including indexing portions circumferentially spacedtherearound and first drive means having driving portionscircumferentially spaced at a predetermined angle therearound which meshin driving relationship with the indexing portions of the first drivenmeans when said first drive means is in engagement with the first drivenmeans while the first drive means is in a first position; second one-waydrive means including second driven means coupled to the second turretfor rotation therewith, said second driven means including indexingportions circumferentially spaced at the predetermined angle therearoundand second drive means having driving portions circumferentially spacedat the predetermined angle therearound which mesh in drivingrelationship with the indexing portions of the second driven means whensaid second drive means is in engagement with the second driven meanswhile the second drive means is in asecond position; first selectivelyoperable means for rotating the first drive means from the firstposition through the predetermined angle and returning the first drivemeans to the first position each time said first selectively operablemeans is operated; second selectively operable means for rotating thesecond drive means from the second position through the predeterminedangle and returning the second drive means to the second position eachtime said second selectively operable means is operated; first actuatingmeans operably associated with the first selectively operable means forpositioning the first drive means into engagement with the first drivenmeans and disengaging the second drive means from the second drivenmeans when said first selectively operable means is operated, the firstactuating means including first lost motion means for permitting thefirst selectively operable means to rotate the first drive means fromits first position prior to the engagement of the first drive and drivenmeans; second actuating means operably associated with the secondselectively operable means for positioning the second drive means intoengagement with the second driven means and disengaging the second drivemeans from the second driven means when said second selectively operablemeans is operated, the second actuating means including second lostmotion means for permitting the second selectively operable means torotate the second drive means from the second position prior to theengagement of the second drive and driven means; first biasing means formaintaining the first drive and driven means engaged after initialengagement by the first actuating means until said first drive anddriven means are disengaged by the operation of the second selectivelyoperable means; second biasing means for maintaining the second driveand driven means engaged after initial engagement by the secondactuating means until said second drive and driven means are disengagedby the operation of the second selectively operable means; and switchingceiver for operation in the first frequency band when the firstselectively operable means is operated and for switching the receiverfor operation in the second frequency band when the second selectivelyoperable means operably associated with the first and second semeans isoperated.

lectively operable means for switching the radio reremit:

3 UNITED STATES PATENTDFFEE QERTEFIDATE OF CORREGTWN Patent No. 3,755,74-0 Dated August 28, 1973 Inventor-(s) Terrance W. Maugans It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

Column 1, line 21, change "application A-l4,680" to application .SerialNo. 241,241, now Patent 3,739,307

Column 2, line 22, change "application A-l4,680" to applicationSerialNo. 241,241, now Patent 3,739,307

Signed and sealed this 5th day of February 1974.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. RENE D. TEGTMEYER Attesting Officer ActingCommissioner of Patents

1. An apparatus for switching a voltage tuned radio receiver betweenfirst and second frequency bands and for rotating a turret comprisingdrive means; driven means coupled to the turret for rotation therewith;first selectively operable means for imparting a drive motion to thedrive means when said first selectively operable means is operated;second selectively operable means; first actuating means operablyassociated with the first selectively operable means for engaging thedrive and driven means when said first selectively operable means isoperated, the first actuating means including lost motion means forpermitting the first selectively operable means to impart a drive motionto the drive means relative to the driven means prior to the engagementof the drive and driven means; second actuating means operablyassociated with the second selectively operable means for disengagingthe drive and driven means when said second selectively operable meansis operated; biasing means for maintaining the drive and driven meansengaged after initial engagement by the first actuating means until saiddrive and driven means are disEngaged by the operation of the secondselectively operable means; and switching means responsive to the firstand second selectively operable means for switching the radio receiverfor operation in the first frequency band when the first selectivelyoperable means is operated and for switching the radio receiver foroperation in the second frequency band when the second selectivelyoperable means is operated.
 2. An apparatus for rotating first andsecond turrets of a voltage tuned radio receiver comprising first drivemeans; second drive means; first driven means coupled to the firstturret for rotation therewith; second driven means coupled to the secondturret for rotation therewith; first selectively operable means forimparting a drive motion to the first drive means when said firstselectively operable means is operated; second selectively operablemeans for imparting a drive motion to the second drive means when saidsecond selectively operable means is operated; first actuating meansoperably associated with the first selectively operable means forengaging the first drive and driven means and disengaging the seconddrive and driven means when said first selectively operable means isoperated, the first actuating means including first lost motion meansfor permitting the first selectively operable means to impart a drivemotion to the first drive means relative to the driven means prior tothe engagement of the first drive and driven means; second actuatingmeans operably associated with the second selectively operable means forengaging the second drive and driven means and disengaging the firstdrive and driven means when said second selectively operable means isoperated, the second actuating means including second lost motion meansfor permitting the second selectively operable means to impart a drivemotion to the second drive means relative to the second driven meansprior to the engagement of the second drive and driven means; firstbiasing means for maintaining the first drive and driven means engagedafter initial engagement by the first actuating means until said driveand driven means are disengaged by the operation of the secondselectively operable means; and second biasing means for maintaining thesecond drive and driven means engaged after initial engagement by thesecond actuating means until said drive and driven means are disengagedby the operation of the first selectively operable means.
 3. Anapparatus for rotating first and second turrets of a voltage tuned radioreceiver and for switching said receiver between first and secondfrequency bands comprising first one-way drive means including firstdriven means coupled to the first turret for rotation therewith, saidfirst driven means including indexing portions circumferentially spacedtherearound and first drive means having driving portionscircumferentially spaced at a predetermined angle therearound which meshin driving relationship with the indexing portions of the first drivenmeans when said first drive means is in engagement with the first drivenmeans while the first drive means is in a first position; second one-waydrive means including second driven means coupled to the second turretfor rotation therewith, said second driven means including indexingportions circumferentially spaced at the predetermined angle therearoundand second drive means having driving portions circumferentially spacedat the predetermined angle therearound which mesh in drivingrelationship with the indexing portions of the second driven means whensaid second drive means is in engagement with the second driven meanswhile the second drive means is in a second position; first selectivelyoperable means for rotating the first drive means from the firstposition through the predetermined angle and returning the first drivemeans to the first position each time said first selectively operablemeans is operated; second selectively operable means for rotating thesecond drive means from the second position through the predeterminedangle and returning the second drive means to the second position eachtime said second selectively operable means is operated; first actuatingmeans operably associated with the first selectively operable means forpositioning the first drive means into engagement with the first drivenmeans and disengaging the second drive means from the second drivenmeans when said first selectively operable means is operated, the firstactuating means including first lost motion means for permitting thefirst selectively operable means to rotate the first drive means fromits first position prior to the engagement of the first drive and drivenmeans; second actuating means operably associated with the secondselectively operable means for positioning the second drive means intoengagement with the second driven means and disengaging the second drivemeans from the second driven means when said second selectively operablemeans is operated, the second actuating means including second lostmotion means for permitting the second selectively operable means torotate the second drive means from the second position prior to theengagement of the second drive and driven means; first biasing means formaintaining the first drive and driven means engaged after initialengagement by the first actuating means until said first drive anddriven means are disengaged by the operation of the second selectivelyoperable means; second biasing means for maintaining the second driveand driven means engaged after initial engagement by the secondactuating means until said second drive and driven means are disengagedby the operation of the second selectively operable means; and switchingmeans operably associated with the first and second selectively operablemeans for switching the radio receiver for operation in the firstfrequency band when the first selectively operable means is operated andfor switching the receiver for operation in the second frequency bandwhen the second selectively operable means is operated.